| Name | Meaning | Gender | Origin |
|---|
| Joe | Abbreviation of Joseph.
| Male | English |
| Jones | God Will Bring | Male | Welsh |
| Julius | after Julius Caesar | Male | Latin |
| Jupiter | Zeus, Father | Male | Roman |
| Kat | pure | Female | English |
| Kermit | free man | Male | Irish |
| Kiara | Italian, light, clear | Female | Spelling |
| Kirara | | Unisex | |
| Kitten | | Unisex | |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Korky | | Unisex | |
| Krazy | | Unisex | Hebrew |
| Krazy Kat | | Unisex | Hebrew |
| Kyo | Approval, Ginger, Or Large | Unisex | Japanese |
| Louie | renowned warrier | Male | English |
| Lucifer | light-bearer | Male | Latin |
| Lucifer | light-bearer | Male | Latin |
| Luna | moon | Female | Latin |
| Macavity | | Unisex | |
| MacKenzie | Child of the wise leader
| Female | Scottish |
| Maisie | child of light | Female | Scottish |
| Malinki | after Lynley Dodd's childrens book Slinky Malinki | Unisex | |
| Man | | Unisex | Hebrew |